Fig. 11. Normal MR anatomy. (A) Coronal T1 fat-saturated images of anterior aspect of the hip demonstrating iliofemoral ligament (arrows) and free edges of the anterior labrum superiorly (white arrowhead) and inferiorly (black arrowhead). The anterior labrum is better assessed on axial images. (B) Coronal T1 fat-saturated image of mid-hip with a normal triangular-shaped labrum (white arrow) firmly attached to the acetabular rim. Inferomedially lies the transverse acetabular ligament (black arrow), which should not be confused with a labral abnormality. Medially, a normal appearing ligamentum teres (black arrowhead) arises from the transverse acetabular ligament and extends to the fovea. Note normal perilabral capsular recess is adjacent to the labrum (white arrowhead). (C) Oblique axial T2 fat-saturated images of the superior aspect of the hip demonstrating the free edge of the superior labrum (black arrowhead), which is better evaluated on coronal images. Note the appearance of the rectus femoris direct (black arrow) and reflected heads (open arrow) and the normal gluteus minimus insertion on anterior aspect of greater trochanter (white arrow). (D) Oblique axial T2 fat-saturated images of mid aspect of hip demonstrating normal dark triangular appearance of well-attached anterior (black arrow) and posterior labrum (white arrow). Curvilinear gray signal of the femoral head and acetabular cartilage blend together (black arrowheads). The anterior capsule and iliofemoral ligament (short arrows) are seen as well as the posterior capsule (white arrowhead).
which can make evaluation of the labrum more difficult. Lack of this recess may also be seen in dysplastic hips with a hypertrophied labrum . Second, a sublabral sulcus or recess under the labrum in the anterior superior quadrant has been described by some, yet others with surgical and anatomic studies have not identified this finding . In our experience, the presence of a small defect
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